Push-in connectors for water filters

The ASV7 angle valve adapter from John Guest is the ideal choice when you need to connect a 3/8" plastic tube to your water filter or reverse osmosis system. It is mounted directly onto the cold water angle valve under the sink, creating a stable and secure connection.Equipped with an integrated check valve, the adapter protects your water installation against backflow. The built-in shut-off valve allows for easy water supply interruption, making filter changes and maintenance particularly convenient. A practical and reliable spare part for various kitchen and water treatment applications.Thanks to robust brass connections and premium plastic components, the ASV7 guarantees long-lasting performance and a reliable seal. John Guest stands for quality you can trust in every installation.Benefits at a glance:Compatible with 3/8" plastic tubingCheck valve for backflow protectionShut-off valve for convenient maintenanceStrong brass and plastic constructionSuitable for filter systems and water installationsThe product range is not suitable for compressed air, explosive gases, petroleum, or other liquids or in heating systems or similar applications.

The ASV9 angle valve adapter from John Guest is the perfect solution for connecting water filters, reverse osmosis systems and other appliances directly to your cold water supply. With its precise 3/8" thread and 1/4" tube connection, it offers the standard size for most water filter systems, ensuring maximum compatibility.The built-in check valve reliably prevents backflow into the water line, while the integrated shut-off valve makes it easy to stop the water flow whenever maintenance or filter replacement is required. This ensures safety and convenience for your water filter or reverse osmosis system.Made from durable brass and high-quality plastic, the ASV9 provides a secure and long-lasting connection. With this John Guest spare part, you get proven quality and reliable performance for your water installation.Benefits at a glance:Standard 1/4" size for reverse osmosis systems and water filtersIntegrated check valve for safe operationConvenient shut-off valve for easy maintenanceHigh-quality materials for long-lasting useSuitable for coffee machines, water dispensers and water treatmentThe product range is not suitable for compressed air, explosive gases, petroleum, or other liquids or in heating systems or similar applications.

The 1/4" check valve from John Guest is the reliable solution for water filter systems and reverse osmosis units. With its standard size, it fits perfectly into most common systems and effectively prevents water from flowing back. This ensures that the quality of your filtered water remains protected at all times and extends the lifespan of your system.Made from high-quality materials, this John Guest spare part stands out with its durability and ease of use. Installation is quick and requires no special tools, so you can easily fit the check valve yourself. Especially in water filtration technology, quality and precision matter – and this valve delivers both.Whether for home use or professional applications, the 1/4" check valve supports the reliable operation of your reverse osmosis system. It ensures that water flows only in the intended direction and provides lasting protection for your components.Key Benefits: Standard 1/4" size – perfect for water filter systems and reverse osmosis unitsReliable protection against water backflowPremium John Guest quality for long-lasting performanceEasy installation without special toolsIncreases safety and efficiency of your systemThe product range is not suitable for use in the compressed air and vacuum sector.

The 3/8" check valve from John Guest provides dependable protection against backflow in larger water filter systems and reverse osmosis units. It has been designed for applications that require higher flow rates, ensuring consistent performance and safety even in demanding environments.Thanks to proven John Guest craftsmanship, this check valve is robust and highly durable. Installation is simple and can be completed in just a few steps, adding a vital component to your filtration system for smooth operation.If you’re looking to upgrade your reverse osmosis system or water filtration unit with a reliable John Guest spare part, the 3/8" check valve is an excellent choice. It safeguards your system and ensures a steady supply of high-quality water at all times.Key Benefits:3/8" size for higher flow capacityEffective protection against water backflowRobust construction in trusted John Guest qualityQuick and easy installationExtends the lifespan of your reverse osmosis and filtration systemsThe product range is not suitable for use in the compressed air and vacuum sector.

The John Guest T-Reducer Connector PM3022AE combines outstanding quality with easy handling. It connects two 22 mm tubes to a 15 mm tube – perfect for water filter systems, reverse osmosis units and other drinking water applications. The quick-connect design allows a tool-free installation that is clean, secure and reliable.Made from durable, food-grade plastic, this T-fitting ensures a tight seal and long-lasting performance, even under regular use. It’s ideal for home water systems, laboratories and commercial setups where consistent water flow and pressure are essential.Whether used as a replacement part or in new installations, the John Guest T-Reducer offers effortless and professional results. Simply push the tubes in – no need for screws, clamps or soldering. Reliable, fast and built for long-term performance.Your Benefits at a Glance:Perfect for water filters and reverse osmosis systemsTool-free quick-connect fittingCompatible with 22 mm and 15 mm tubingManufactured by John Guest, a trusted brand in fluid connection technologyIdeal as a replacement part or for extending existing systemsFood-grade and safe for potable waterFast installation and high leak resistanceThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

The high-quality John Guest 3/8" OD Angle Shut-Off Valve provides a reliable and convenient solution for safe water connections in kitchens and households. Perfect for water filters, reverse osmosis systems, coffee machines, and drinking water dispensers, it allows precise control of water flow and enables individual appliances to be shut off without interrupting the main water supply.Thanks to the John Guest push-fit connection, installation is quick, secure, and tool-free. The built-in non-return valve prevents backflow into the water network in compliance with DIN 1988 / EN 1717. Its durable construction ensures a long service life, making it suitable for both domestic and commercial use.Ideal for maintenance work, filter changes, or appliance replacement – one simple movement shuts off the water flow safely. This angle valve combines safety, reliability, and ease of use – an essential spare part for every professional water filtration setup.Key benefits:Fits 3/8" OD tubingPerfect for water filters, reverse osmosis systems, and coffee machinesIndependent shut-off without interrupting main water flowBuilt-in check valve prevents backflowEasy tool-free installation with John Guest push-fit technologyDurable and high-quality constructionCompliant with DIN 1988 / EN 1717

The John Guest adapter with 3/4“ female BSPP thread to 3/8“ tube connection is the right choice when larger systems with higher flow rates need to be connected. It provides a secure and precise link between the angle valve and your water treatment equipment.The adapter is mounted directly on the 3/4“ cold water inlet under the sink and enables the connection of reverse osmosis systems, professional water filters, coffee machines or water dispensers. In our water filter systems, it is used together with the Hydro Stopper, ensuring a reliable and tight installation at the angle valve.Thanks to the precise John Guest engineering, this adapter ensures a stable and long-lasting fit. For anyone seeking a trustworthy spare part for drinking water systems, this adapter combines safety, durability and easy handling in one.Customer Benefits at a Glance:3/8” connection for systems with higher water flowUse in combination with the Hydro Stopper at the angle valveSuitable for reverse osmosis, water filters, coffee machines and water dispensersPremium John Guest quality and durabilityLong-lasting, leak-proof connection for drinking water applications

The John Guest adapter with 3/4“ female BSPP thread to 1/4“ tube connection is the perfect accessory to connect water filters and reverse osmosis systems safely to your cold water supply. Since 1/4" is the standard size for most drinking water filters, this adapter is the ideal choice for under-sink installations.The adapter is mounted directly on the 3/4" cold water supply at the angle valve and ensures a leak-proof connection for water filters, reverse osmosis systems, coffee machines or water dispensers. In our water filter systems, it is specifically used together with the Hydro Stopper, which is installed at the angle valve. This makes the installation quick, secure and highly reliable.With the proven John Guest quality, you benefit from a robust and durable fitting that perfectly integrates into your existing setup. Handling is simple, the connection is leak-free, and it is ideally suited for drinking water applications. An essential spare part for anyone who values safe and clean water.Customer Benefits at a Glance:Standard size 1/4” – perfect for reverse osmosis systems and water filtersDesigned for use with the Hydro Stopper at the angle valveCompatible with coffee machines, water dispensers and water treatment systemsDurable and reliable John Guest qualityQuick and easy installation without toolsThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

The John Guest T-Connector with 15 mm outer diameter provides a secure and long-lasting connection for water filtration systems, reverse osmosis setups, and other applications involving drinking water. Its reliable push-fit design ensures a tight seal without the need for tools or sealing materials. Simply insert the tubing and enjoy a solid, pressure-resistant connection.This connector is perfect for branching water lines in three directions, whether you are installing a reverse osmosis system or expanding an existing water filter setup. The durable plastic body offers excellent resistance to pressure, temperature, and chemicals, ensuring a long service life and consistent performance.With its precise fit and trusted John Guest quality, the T-Connector guarantees maximum safety and efficiency. Suitable for professional installations as well as home projects, it delivers reliability, comfort, and convenience to any water filtration system.Key Benefits:Easy push-fit connection – no tools neededSuitable for water filters, RO systems, and beverage equipmentDurable and high-quality plastic constructionSecure and leak-free connectionPerfect for 15 mm tubing branchesFood-grade and NSF certifiedThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

The John Guest Push-Fit Connector 15 mm x 3/4" Male Thread (Part No. PM011516E) provides a dependable and durable solution for connecting tubing in water filters, reverse osmosis systems, and filtration equipment. Designed for precision and safety, it ensures a tight and reliable seal that supports long-lasting performance in both residential and commercial applications.Made from high-quality acetal material, this fitting delivers excellent resistance to pressure and temperature changes. It fits perfectly into home water filters, drinking water systems, and professional filtration setups. The quick-connect design allows for easy installation and removal without the need for tools, making maintenance and system upgrades straightforward and efficient.With this original John Guest fitting, users benefit from proven quality and reliability. The precisely machined threads and smooth push-fit connection ensure a leak-free performance, even under demanding conditions. It’s the perfect choice for anyone who wants to maintain or expand their water purification system with trusted components.Key Benefits:Connects 15 mm OD tubing to 3/4" female thread (BSPF)Fast, tool-free installationLeak-proof and long-lasting performanceFood-grade and safe for drinking water systemsIdeal for water filters, reverse osmosis units, and spare partsGenuine John Guest qualityThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

The John Guest elbow connector for 15 mm outside diameter tubing is the perfect solution for secure and easy connections in water applications. Its push-fit technology allows effortless installation without special tools while ensuring a leak-proof and reliable seal.Thanks to its 90° angle design, tubing can be routed neatly even in limited space. This makes the connector not only ideal for reverse osmosis and water filtration systems but also for other applications where durable and precise connections are required.With this original John Guest spare part, you benefit from a product known worldwide for its outstanding quality. Strong, reliable, and designed for everyday use, this elbow connector ensures your system stays safe and efficient.Customer Benefits at a Glance:Fits 15 mm outside diameter tubingEasy push-fit installation without toolsSecure and reusable connectionPerfect for water filters, RO systems and moreGenuine John Guest spare part with superior qualityThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

The John Guest Bulkhead Connector 3/8" is the perfect choice for installations requiring larger tubing to pass securely through housings or panels. With its threaded body and supplied lock nut, the connector can be tightly fastened, ensuring a stable and durable bulkhead fitting even in systems with higher flow rates.Installation is fast and straightforward thanks to John Guest’s push-fit technology. Simply insert the tube and the connection locks firmly in place, creating a reliable, leak-free seal. This makes the 3/8" bulkhead connector particularly well-suited for reverse osmosis and water filter systems with greater capacity.Constructed from food-grade plastic and equipped with a strong fixing nut, this connector provides long-lasting, hygienic performance for professional water treatment setups.Key Benefits:3/8" size for higher flow applicationsSecure bulkhead fitting through housings and panelsLocking nut provides strong and stable fixationQuick-Connect system for hassle-free installationFood-grade material for safe drinking water applicationsThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

The John Guest Female Adaptor PI451213S is a premium connector designed for 3/8" tube (OD) to 3/8" BSP female thread. It offers a reliable, precise fit and an effortless installation experience – perfect for water filters, reverse osmosis systems, and other beverage or water treatment setups.Made from durable, food-grade plastic, this fitting ensures a leak-free and secure connection, even under continuous use. The John Guest push-fit technology allows quick assembly without tools, making it the ideal choice for both professional installers and DIY enthusiasts.Whether used as a replacement part or for new system installations, this adaptor combines durability, safety, and outstanding performance for all types of water filtration systems.Key Benefits:Quick and secure connection without toolsCompatible with 3/8" OD tube and 3/8" female threadPerfect for water filters, RO systems, and beverage setupsGenuine John Guest quality – long-lasting and reliableMade from food-grade, hygienic materialsMaintenance-free and reusableThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

The PM series for metric tube dimensions is made from black acetal copolymer (POM) plastic and is equipped with food-safe nitrile O-rings.The product range can be used in particular for liquid media, air and inert gases and is therefore also suitable for N2 and CO2. The PM series products are also suitable for pneumatic and vacuum applications in a wide variety of industrial sectors.Properties:     simple and quick installation "right first time"     ideal for compressed air and liquids     mountable without tools     fast, multiple disconnection possible     very good flow propertiesThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

The PM series for metric tube dimensions is made from black acetal copolymer (POM) plastic and is equipped with food-safe nitrile O-rings.The product range can be used in particular for liquid media, air and inert gases and is therefore also suitable for N2 and CO2. The PM series products are also suitable for pneumatic and vacuum applications in a wide variety of industrial sectors.Properties:     simple and quick installation "right first time"     ideal for compressed air and liquids     mountable without tools     fast, multiple disconnection possible     very good flow propertiesThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

Give your water treatment system the reliable connection it deserves: this 3/8" male threaded elbow connector with 3/8" tube fitting and sealing ring is designed for the 500 GPD membrane housing (Art.-No. 6000011) and ideally suited for drinking water applications and reverse osmosis systems. With its tool-free installation you can quickly install it and begin using your filter system immediately.The clever angle design allows you to save space and achieve a neat installation – whether under the sink, inside the filtration cabinet or at your module mounting point. With this connector in your water filter system you ensure clean pipe routing, secure connections and long-term reliability.Key Benefits at a glance:Tool-free, quick installation3/8" male thread to 3/8" tube connection with sealOptimised for drinking water and water-filtration systems (e.g. RO systems)Designed for repeated disconnecting and reconnectingFully compatible with the 500 GPD membrane housing (Art.-No. 6000011)Space-saving elbow shape for tidy pipe layoutDurable materials for long service life in your filtration system

The John Guest Push-Fit Elbow Connector 3/8" Stem to 1/4" Tube OD offers a fast, secure, and leak-free connection for water filters, reverse osmosis systems, and other drinking water applications. Built from high-quality, food-grade materials, this fitting ensures lasting performance and reliability in both home and professional environments.Its compact 90° design allows for neat, space-saving installation behind appliances or under sinks. The push-fit technology enables quick assembly without tools or sealing tape. The precision-engineered connection holds the tubing firmly in place, making maintenance and replacement simple and efficient.Whether used as a spare part for your reverse osmosis system, an upgrade for your water filter, or for custom water projects, this John Guest connector delivers professional-grade performance and durability. Trusted worldwide, John Guest fittings represent the highest standards in water connection technology.Key Benefits:Fits 3/8" stem to 1/4" tube outer diameterQuick, secure push-fit connectionMade from food-grade, pressure-resistant plasticPerfect for RO systems, water filters, and beverage linesCompact 90° design for tight spacesGenuine John Guest qualityThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

The John Guest push-fit elbow connector in 3/8" is designed for water filtration systems, reverse osmosis units and setups requiring larger tube sizes. With its push-fit technology, connections are made quickly and securely without tools. This ensures a clean and hassle-free installation every time.Its durable construction guarantees leak-free performance, even when operating under pressure. The 3/8" version is especially suitable for applications where higher flow rates are required, making it a reliable choice for advanced filtration systems.Like all John Guest spare parts, this elbow connector offers long-lasting quality, food-grade safety and simple handling. It’s the right solution for anyone who wants to upgrade or maintain their water system with trusted components.Key Benefits:Ideal for 3/8" water filters and RO systemsQuick installation with proven push-fit technologySecure and leak-proof connectionsLong-lasting, food-grade materialGenuine John Guest spare partThe product series is not suitable for use in compressed air and vacuum areas.

The John Guest Y-Connector 3/8" Tube OD (PP2312W) delivers reliable performance and effortless installation. Designed for use in water filtration systems, reverse osmosis units, and various water treatment applications, this high-quality push-fit fitting ensures a secure and leak-free connection every time.Made from durable, food-grade plastic, the Y-connector offers excellent resistance to pressure and temperature variations. It allows smooth water distribution between three lines, making it an essential component for efficient water management in filter or RO systems.Perfect as a replacement part or system upgrade, this John Guest fitting combines long-lasting quality with simple handling. Its precise design ensures a tight seal and a hygienic connection in any potable water setup.Key Benefits:Suitable for 3/8" tube outer diameterPerfect for water filters, reverse osmosis, and water treatment systemsFood-grade plastic for hygiene and durabilityQuick, tool-free installationLeak-proof and highly reliableGenuine John Guest qualityThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

The John Guest Push-Fit Connector 3/8" Tube OD to 1/2" NPTF Male Thread provides a secure and durable connection for water filters, reverse osmosis systems, and a wide range of drinking water applications. Its easy push-fit design ensures a tight, leak-free seal and allows for quick installation without the need for special tools. Simply push in, tighten, and the connection is ready.Made from strong, food-grade acetal, this connector delivers excellent resistance to pressure and temperature variations. It’s an ideal choice for use in water filtration systems, aquariums, beverage dispensers, and refrigerators with water connections. Precision manufacturing guarantees a perfect fit and long-lasting reliability between tube and thread.Whether used as a replacement part or for building a new filtration system, this John Guest connector ensures consistent performance and ease of use. Its proven push-fit technology saves time during assembly while maintaining maximum safety for your drinking water.Customer Benefits at a Glance:Fast, tool-free installationDurable, food-grade materialIdeal for RO systems and water filtersReliable, leak-proof connectionPerfect as a replacement or for new setupsThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

The John Guest PP481223W Elbow Connector stands for premium quality and long-lasting reliability. Designed for 3/8“ tube OD to 3/8“ NPTF male thread connections, it’s the perfect choice for water filters, reverse osmosis systems, and other drinking water applications. Precision manufacturing ensures a secure, leak-free fit.The push-fit technology allows a quick and effortless installation. Simply push the tube in until it clicks – the connection is made and sealed. The durable polypropylene body is food-grade, corrosion-resistant, and fully approved for potable water use, keeping your water pure and safe.Whether you’re replacing an old fitting or setting up a new water filtration system, the PP481223W is a reliable spare part that delivers consistent performance. Its compact design provides flexibility and saves space in tight installation areas.Customer Benefits at a Glance:Fits 3/8“ tube OD and 3/8“ NPTF male threadFast, tool-free connection with push-fit systemHigh-quality, food-grade polypropylene materialPerfect for water filters, RO systems, and potable water setupsCorrosion-free, pressure-resistant, and durableCompact size ideal for limited space installationsThe product range is not suitable for compressed air, explosive gases, petroleum or other liquids as well as in heating systems or similar areas of application.

The John Guest 3/8" Equal Tee Connector (Part No. CI0212W) offers outstanding quality and reliability for professional water connections. Designed for use in water filters, reverse osmosis systems and other potable water applications, it provides a safe and leak-free connection for three 3/8" outer diameter tubes.Thanks to the proven push-fit technology, installation takes only a few seconds. Simply insert the tube, and the connection is instantly secure and watertight. The durable acetal construction ensures excellent resistance and long service life, even under demanding conditions.This John Guest Tee Connector is the ideal choice for anyone who values precision and hygiene. Whether in domestic setups, catering environments or industrial water systems, it guarantees a clean and professional connection every time.Customer Benefits at a Glance:Quick and easy installation with push-fit designFood-grade and hygienic materialCompatible with water filters, RO systems and coolersReliable, leak-free connection without toolsPerfect for replacements or new installationsThe product series is not suitable for use in compressed air and vacuum areas.

The John Guest Straight Reducer Connector CM201512W ensures a secure and leak-free connection between two tubes with different outer diameters of 15 mm and 12 mm. This high-quality push-fit fitting allows for a quick and reliable installation, commonly used in water filtration systems, reverse osmosis units and other drinking water applications.The durable plastic body is made from food-grade material, ensuring maximum hygiene and long-lasting performance. The connector is easy to install and remove without tools, offering a flexible solution for maintenance, upgrades or repairs in any water system.Whether used at home, in laboratories or in the catering industry, the John Guest reducer connector stands out with precise engineering, excellent sealing performance and proven durability. It’s the ideal spare part for anyone who values quality and reliability.Customer Benefits at a Glance:Simple push-fit installation without toolsDurable, food-grade materialFits 15 mm and 12 mm tubing systemsPerfect for water filters and reverse osmosis systemsReusable and easy to maintainReliable sealing for clean drinking waterThe CM series is not suitable for compressed air and vacuum applications.

The John Guest Straight Connector 15 mm (PM0415E) provides a clean and reliable solution for connecting water filters, reverse osmosis systems, and other drinking water setups. Its high-quality push-fit design ensures quick, tool-free installation that’s both leak-free and durable – ideal for DIY enthusiasts and professionals alike.Crafted from food-grade engineering plastic, this connector offers excellent resistance to pressure and temperature. Designed specifically for potable water use, it’s perfect for water filters, RO systems, aquarium setups, and various fluid applications where purity and safety matter.Whether used as a spare part or to expand an existing system, the John Guest connector delivers a strong, dependable connection between 15 mm tubing, ensuring your water filtration setup remains efficient, clean, and leak-free.Key Benefits:Quick and easy installation without toolsLeak-proof performance with precision fitSuitable for water filters, RO systems, and potable water applicationsMade from durable, food-grade plasticReusable and long-lastingFully compatible with all John Guest 15 mm fittingsThe connectors are also ideal for air, non-flammable gases (e.g. N2 and CO2) and vacuum applications.

The John Guest Elbow Connector 3/8" Tube OD is the smart solution for anyone who wants to upgrade their reverse osmosis system or water filter to a professional level. Its precise 90° design saves space, keeps tubing neat, and ensures a reliable water flow throughout your system.The proven push-fit system allows quick and effortless connections without the need for tools — simply push the tube in and it locks securely in place. The high-quality plastic construction provides strength, ensures a long service life, and prevents water leakage even with frequent use.This elbow connector fits perfectly with all standard water filter and reverse osmosis systems, making it an essential spare part for those who value quality and durability. Trust in John Guest precision and experience how simple professional water technology can be.Customer Benefits at a Glance:Genuine John Guest push-fit systemDurable construction made from high-quality plasticSuitable for 3/8" OD tubesIdeal for reverse osmosis systems and drinking water filtersQuick, easy installation without toolsThe product series is not suitable for use in compressed air and vacuum areas.